Blender Git Loki

UI: add a message to indicate when using a modifier that wasn't
compiled.

This adds a short message to the smoke, remesh and boolean modifiers' UI
when trying to use them when their compilation was turned off. This was
already implemented for the fluid and ocean simulation modifiers.

This also makes the 'quick fluid' and 'quick smoke' operator abort and
report when trying to use them when unavailable.